"Sun, 25 Jan 1970 20:35:37"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700125
Only TIME
20:35:37
General datetime
1970-01-25 20:35:37Z
For Database
1970-01-25 20:35:37
For HTTP1.1
Sun, 25 Jan 1970 20:35:37 GMT